Part of the four stately in their walk, Proverbs 30:29–31.
Quick answer
The last three, and the first of them is a genuine puzzle. Whatever animal it is, it is followed by a goat and then by a king, and the list ends on the human.
Read the whole unit
Four creatures admired for their bearing, with no instruction attached.
Read the whole unit
The last of the numerical sayings, and the least moral. Four things that walk well. There is no lesson attached, no warning, and nothing anybody is told to do. Agur simply admires the way certain creatures move, and the saying is content to stop there.
The list is a lion, then something the translators cannot identify, then a male goat, then a king with his army around him. Its subject is bearing rather than power: not what these four can do, but how they carry themselves while doing it. The lion is described as not turning aside from anything, which is a statement about composure rather than about strength.
And then the chapter's next sentence is "If you have been foolish in exalting yourself." Nothing joins them grammatically, and the catalog does not claim the editor intended it. But the placement is there, and it reads the way the book usually reads: an admiring look at four things that carry themselves well, immediately followed by an instruction for the person who has been trying to. Stateliness, in this arrangement, is something you have or do not. It is not something you can perform your way into.
What this verse contributes
The descent from the lion to the ordinary, and then the turn to a man. A male goat leading a flock is not an impressive animal, and putting it between a lion and a king is the saying's quiet joke. Bearing is not reserved for the magnificent.
Then the king, and the list closes where the chapter's other list closed, in a palace. What makes him stately is stated in the same breath as who he is: his troops are with him. He walks well because he is not alone, which is the least self-made item on a list about how one carries oneself.
Why translations differ
The first word is זַרְזִיר מָתְנַיִם, literally something girded at the waist, and the NKJV prints greyhound while footnoting "Or perhaps strutting rooster, lit. girded of waist." Other versions choose the rooster, the war horse, or leave it undecided. Nobody knows. The last phrase of the verse, אַלְקוּם, is equally obscure, and the NKJV's "whose troops are with him" is one reading among several. This is a verse to enjoy rather than to build on, and the catalog claims nothing about either word.
Related: Proverbs 30:28 · Proverbs 14:28
New King James Version®, Copyright © 1982, Thomas Nelson. All rights reserved. Full copyright information. Scripture provided by API.Bible.
Go Deeper
If this verse has been used to put weight on you that it was never carrying, ask about it directly.